Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

This method can help answer key questions about the ultra fast dynamics of polyatomic radical cations such as whether coherent vibrational motions are excited and how coherent exotation drives bond association. The main advantage of this technique is that polyatomic radical cations may be prepared in the ground electronic state, which significantly improves the ability to resolve coherent vibrational motions. Generally, individuals new to this method would struggle with setting up two independent beam path with identical path name in ensuring that the two beams propagate exactly parallelly or collinearly when necessary.

First, turn the femtosecond laser on and wait for about 30 minutes for it to stabilize. Position a 90/10 beam splitter after the laser output to generate two replica, which will be used to construct the pump and probe beam lines. Check the laser power before the beam splitter and the power of the transmitted beam to ensure that approximately 10%of the power is transmitted.